Commissioned by an Ilkhanid administrator from Ashtarjan and dated by two separate inscriptions to 1315–16, this mosque has survived in excellent condition.

While the mosque was built under Oljeitu's officially Shi'ite rule (evidenced by the inclusion of the Twelve Imams' names), its construction was commissioned by Fakhr al-Dunya wa'l-Din Muhammad b. Mahmud b.

His inflated titles, like "King of the Viziers in the Universe," highlight the changing nature of political authority during this period.

Exposed brick is found only in the arcades, although possibly this area originally had a plaster coat as is employed extensively in the rest of the structure.

Across the interior of the dome, decorative terracotta elements form eight radial ribs; diverse painted plaster patterns fill the interstices.

Despite this, the surviving sections continue to frame a 13-metre-high (43 ft) doorway, exemplifying the architectural sophistication of the Ilkhanid style.

[2] One of the most important revelations from the inscriptions is the identity of the mosque's patron, Fakhr al-Dunya wa'l-Din Muhammad b. Mahmud b.

While his titles, al-sahib al-a'zam and malik al-wuzara' fi'l-'alam ("the most great lord, king of viziers in the universe"), suggest a high-ranking official, Miles demonstrates that this was not the case in 715/1315, the year the mosque was built.

[2] Through a comparative analysis of contemporary inscriptions, the title of vizier had become more common in the Ilkhanid period and was no longer reserved solely for the highest officials.

For example, the repeated invocation of the names of Muhammad and the Twelve Imams in Kufic script highlights the Shi'ite character of the mosque and links its construction to the broader context of the Ilkhanid state's official adoption of Shi'ism under Oljeitu.

This inscription, commissioned during the reign of the Aq Qoyunlu ruler Uzun Hasan, also underscores the enduring practice of pious patronage for mosque upkeep and renovation.